Adapter

Placeholder content. Stub so the structural folder appears in the tree. Replace before publishing.

An adapter converts one interface into another that a client already expects, letting two classes work together without either knowing about the other.

Shape

public interface PaymentGateway {
  void charge(long cents);
}

public class StripeAdapter implements PaymentGateway {

  private final StripeClient stripe;

  @Override
  public void charge(long cents) {
    stripe.createCharge(cents / 100.0, "usd"); // translate the call
  }
}

The value is not the wrapping — it is that the client depends on PaymentGateway, so swapping Stripe for something else touches one class.